I know I have not posted the construction of my AstroPi up in the forum, I did find a flaw with the Sense Hat design and it's been confirmed by the people at Raspberry Pi.
 
In playing around with the AstroPi, I noticed that the AstroPi internal temperature was rising. I thought it was due to that I am using an R-Pi 3 which runs hot. Though that is part of the reason, the thermometer should not be registering heat inside the Astro Pi. The Raspberry Pi Foundation fessed up and admitted in rushing a job and creating a flaw within the Sense Hat. The flaw is that the thermometer is right above the CPU area of R-Pi when it is inside the case. This causes the thermometer to measure the heat generated by the CPU and I/O Chips on the R-Pi.
 
If the Sense Hat was in a totally different case, this would have been design fine. But in the AstroPi case, it is flawed. Since the those units up in the ISS has this flaw, so does all the other Sense Hats sold to the public - they all have the same flaw. Ha!
 
Here are the links:
https://www.raspberrypi.org/forums/viewtopic.php?f=104&p=1226425
and
https://astro-pi.org/principia/science-results/#watchdog

This flaw only affects the Sense Hat when installed in an Astro-Pi case. If the Sense Hat was connected to the R-Pi with some sort of extension cable and inside a separate case, then it will be fine.